#include"test.h"
using namespace std;
void STInit(ST* ps)
{

	assert(ps);
	ps->a = NULL;
	ps->capacity = 0;
	ps->top = 0;
}
void STDestroy(ST* ps)
{
	assert(ps);
	free(ps->a);
	ps->a = NULL;
	ps->capacity = ps->top = 0;

}
void STPush(ST* ps, STDataType x)
{
	assert(ps);
	if (ps->top == ps->capacity)
	{
		int newCapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		STDataType* tmp = (STDataType*)realloc(ps->a, sizeof(STDataType) * newCapacity
		);
		if (tmp == NULL)
		{
			perror("realloc fail");
			exit(-1);

		}
		ps->a = tmp;
		ps->capacity = newCapacity;
	}ps->a[ps->top] = x;
	ps->top++;

}
STDataType  STPop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);
	return ps->a[ps->top-1];

}
int STSize(ST* ps)
{
	assert(ps);
		return ps->top;
}
bool STEmpty(ST* ps)
{
	assert(ps);

	return ps->top == 0;
}